Improvement in fan-blowers



PATRICK CLARK, OF RAHW'AY, NET JERSEY.

IMPROVEMENT IN FAN-BLOWERS.

Specification forming part of Letters Patent No. 58,985, dated October ,23, 1866.

To all whom yit may concern Be it known that I, PATRICK CLARK, of the city of' Rahway, in the county of Union and State of New Jersey, have invented a new and usefulImprovement in Fan-Blowers; and I do hereby declare that the following isa full and exactdescription thereof, reference bein g made to the accompanying drawings, and the letters and figures marked thereon.

In the accompanying; drawings, Figure 1 is a vertical section through the line of the shaft which carries the fans; and Fig. 2 is a vertical section perpendicular tg) the line ofthe shaft, showing one chamber of the compound fan, (of which the others are duplicates,) and also the improved method ot' constructing the fan-wheel.

A A, Figs. 1 and 2, is the outer case of the fan, divided into two compartments by the annular partition P. F F are the fan-wheels, occupying about one-half ofthe width of each chamber. Gr G are stationary diaphragms, attached to the partitions I l by means of the studs E E. The outer periphery of these diaphragm-plates is turned up, so that when the fan-wheel is in its place it is partially covered by these uptnrned edges, leaving, however, sufficient room for the air to pass between their edges and the partition next them into the outer chamber, as indicated by the arrows in Fig. 1. These diaphragms are Vmade to lit the shaft of the fan by means ot' the leather washers l) D, which are attached to the diaphragm in the manner shown, so that it' the diaphragms are not put on exactly concentric to the shaft they will slip to coinpensate for the defect.

The function of these diaphragms is two fold: first, they receive and sustain the thrust of the pressure of the air, which before was exerted against the plate attached to the fanwheel; and, second, they cut oft' all unnecessary communication between the fan-wheel and the air upon which it has already acted, and which Should have as little rotary motion as possible.

An incidental advantage consequent upon the introduction of this diaphragm is, that the air can be delivered through the outlet .n with as much facility as through the outlet Y.

The peculiar construction of the fan-wheel shown in plan, Fig. 2, is also designed to aid in preventing the excessive rotary motion ot' the air after it has left the fan-wheel. To effect this object it is so constructed and arranged that the air is delivered nearly in the line of the tangent to the radins of the fan-wheel.

G (i, Fig. 2, are the arms ot' the fairwheel, and F F are the vanes or fan. These fans have the following form, viz: Beginning where the inner end of the vane is attached to one of the arms, the vane runs for about two-thirds of its length in aline nearly tangent to radius of' the fan-wheel, running through said arm; then on a curve with a radius of about one-sixth the diameter of the fan-wheel to the point ofthe next arm. The fan-wheel runs in the direction ofthe arrow M, Fig. 2, while the air is delivered in the direction of the arrow N consequently, as it leaves the fan, its tendency to move in the direction of the arrow M is diminished, which aids in accomplishing the object aimed at by these improvements. rlhe fan also runs easier by reason ot' the reaction of the issuing air.

I may further remark that the form and arrangement ot' the vanes in relation to each other give the greatest possible space for the tiow of the air consistent with its issue in the line of the tangent.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The diaphragms U U, when used in combination with a compound ian-blower.

2. The fan-wheel F F, when constructed with fans or vanes of the form and arrangement with respect to each other as described.

3. Attaching each fan or vane at its ends to two adjacent arms, as described.

4. The leather packing D D, when combined with the diaphragm U C, as described.

PATRIU l( C L ARK.

NVitnesses:

J ULIA A. CLARK, WILLIAM E. ULARK. 

